[Openswan Users] Cisco-using client wants me to send packets to non-routed networks across tunnel, how can I?

[George Alexander]

I'm with 2.4.8-30.fc6/K2.4.8 (klips).
Last week I brought up a ipsec tunnel with a client connecting my network (
172.20.20.0/24) with his (10.100.100.30/32).
Everything went fine.
This week, I've come to find out, 10.100.100.30 is not the actual IP he
wants me to send packets too.
He wants me to send packets through the tunnel to 10.1.2.0/24 and somehow
still have them go through the tunnel.
I've connected with probably 20 clients and none of them do it this way --
and it seems to me there's not even a way to do it.  Even if I add a route
via ip route/route in linux, I can only specify the interface (ipsec0) and
then it still won't know which tunnel to go out because that network is
unknown to Linux/OpenSWAN.

Is there something I'm missing or is this guy out of his mind?  He says he's
connected with 6 other vendors with this funky method.

Thanks
-George
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